SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Wed Dec 2 14:41:39 PST 2009


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Wednesday, December 2, 2009       2:35 PM      Jim Little

1.  DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638

An upper ridge will cover the eastern Pacific on Thursday with upper flow generally northerly over the Pacific Northwest.  This is a dry pattern with cool night-time temperatures.  In the north offshore flow will be quite brisk but expect only light easterly flow in the south.  Mixing heights will be low for poor to marginal smoke dispersal conditions.


    OUTLOOK (FRIDAY-SUNDAY)

On Friday an upper level trough over southwest Canada will drop south-southeast into the region.  Moisture will be limited but there is a possibility of some snow flurries with this system.  The low will settle in over the area for Saturday and Sunday.  Models differ on the exact location and configuration of this low but there seems to be consensus on only limited moisture.  Temperatures will be very cold, coldest of the season, and there will be a continued possibility of snow flurries.  With the upper low mixing heights will rise for improved smoke dispersal conditions.

2.  DISPERSION

THURSDAY

Zone 630 and 632:
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1000 - 2000 ft then lowering below 1000 ft during the evening.

Transport wind SE to S at 4 - 8 mph during the morning.  Transport wind increases to SSE to SSW at 8 - 14 mph during the afternoon and increases to S to SSW at 10 - 22 mph during the evening.

Surface wind light and variable and controlled by local terrain.  Surface wind increases to SSE to SW at 6 - 10 mph during the evening.

Zone 633 - 638:
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1000 - 2000 ft then lowering below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to SSE to SSW at 4 - 8 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain.  Surface wind increases to SE to S at 4 - 8 mph during the evening.

OUTLOOK:

FRIDAY
In the west mixing height 1000 to 1800 ft throughout the day.  In the east mixing height 1600 to 2600 ft throughout the day.  In the west transport wind SW to WSW at 12 - 22 mph during the morning becoming WSW to W at 12 - 24 mph during the afternoon.  In the east transport wind S to SW at 8 - 14 mph during the morning becoming SW to W at 12 - 24 mph during the afternoon.  Surface wind SSE to SW at 6 - 10 mph during the morning becoming SSW to W at 6 - 10 mph during the afternoon.

SATURDAY
Mixing height 2100 to 3100 ft throughout the day.  Transport wind light and variable.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 2400 to 3400 ft by late morning rising to 4500 to 5000 ft during the afternoon.  Transport wind ENE to ESE at 4 - 8 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 630-638
    The following considerations should be adhered to in addition to
    the requirements of the Oregon Smoke Management Plan. These
    Instructions are valid for burning conducted on Thursday, December 3, 2009.
    ==================================================================

Zone 630 and 632:
Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 11:00am.  Avoid ignitions within 20 miles to the SE through SW of SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Complete ignitions by 3:00pm.

Zone 633 - 638:
Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 11:00am.  Avoid ignitions within 20 miles to the E through SSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the E through SW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.

    =========================================================
4.  SPECIAL NOTE:

    The smoke management forecaster is available at (503)-
    945-7401. Please call this number and not individual's
    numbers to discuss daily burning.  For large burns (over
    2000 tons) or burns extending over a considerable period,
    please request a special forecast.  Avoid calling before
    8 a.m. and between 2 to 3 p.m.

    This forecast is available on the Internet at:
      http://oregon.gov/ODF/FIRE/fire.shtml/#Smoke_Management

    Please ensure your units have been planned and accomplished by checking:
      http://oregon.gov/ODF/FIRE/SMP/dailysmoke.shtml


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listsmart.osl.state.or.us/pipermail/smi_northeast/attachments/20091202/cd2f58a3/attachment.html>


More information about the SMI_Northeast mailing list